Hi @aksal60 ,
According to the [https://servicemanuals.us/sony/tv/kd-55x9000b.html|service manual] a 9 blink error code indicates a problem with the TU board (tuner board). The manual is for both the 55” and the 65” models
Here’s a poor image of the blink error code chart and the location of the TU board.
[image|2347809]
(click on image to enlarge for better viewing)
The service manual can be viewed for free online but it is low resolution, so some sections are hard to make out. Also there are no schematics in the manual.
To download the manual you have to pay for it. To move through the manual you have to select the appropriate page number below the document and click on Go. There are 127 pages in the manual.
Page 71 of the manual shows the location of all the screws that hold the back cover.
Hopefully a start.